IM PREGNANT!! 😊💙💗 but crazy situation!!

So the craziest thing just happened... my husband and I have been trying to get pregnant since the beginning on August, my Lmp was Aug 8th.... 28 days later, no period! So i tested and testing and Nothing! Allll negative! So i called my doctor and over the course of 10 days i did 2 HCG blood draws! Both... NEGATIVE! So they started me on progesterone to help jump start my period... i was on them for 10 days... then waited 10 days... still NO PERIOD! So they retested HCG and did a few other tests yesterday.... and low and behold.... I AM PREGNANT!!😊 and my levels are like 22,000 meaning i am probably over 6 weeks pregnant! For months now i was thinking there was somthing wrong with me! All that worrying for nothing! So i have an ultra sound on monday... still nervous because this is so weird to me! Has anyone ever had this happen to them? Where HCG didnt show up until late?!